Number of nonnegative integer 4 X 4 matrices with no zero rows or columns and with sum of elements equal to n.

A055007

Number of nonnegative integer 4 X 4 matrices with no zero rows or columns and with sum of elements equal to n.

Terms

    a(0) =1a(1) =0a(2) =0a(3) =0a(4) =24a(5) =528a(6) =4648a(7) =26224a(8) =112666a(9) =401424a(10) =1246000a(11) =3476368a(12) =8905432a(13) =21266208a(14) =47875272a(15) =102482048a(16) =210000931a(17) =414160240a(18) =789572072a(19) =1460372624a(20) =2628456428a(21) =4615495808a(22) =7924479264a(23) =13328517504a(24) =21997272036a(25) =35674700896a(26) =56926058920a(27) =89477437120

External references